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Ten-moment fluid modeling of the Weibel instability

Journal Article · · Journal of Plasma Physics

We investigate the one-dimensional non-relativistic Weibel instability through the capture of anisotropic pressure tensor dynamics using an implicit 10-moment fluid model that employs the electromagnetic Darwin approximation. The results obtained from the 10-moment model are compared with an implicit particle-in-cell simulation. The linear growth rates obtained from the numerical simulations are in good agreement with the theoretical fluid and kinetic dispersion relations. The fluid dispersion relations are derived using Maxwell’s equations and the Darwin approximation. We also show that the magnetohydrodynamic approximation can be used to model the Weibel instability if one accounts for an anisotropic pressure tensor and unsteady terms in the generalised Ohm’s law. In addition, we develop a preliminary theory for the saturation magnetic field strength of the Weibel instability, showing good agreement with the numerical results.

Sponsoring Organization:
USDOE
Grant/Contract Number:
NA0003960
OSTI ID:
2563510
Journal Information:
Journal of Plasma Physics, Journal Name: Journal of Plasma Physics Journal Issue: 2 Vol. 91; ISSN 0022-3778
Publisher:
Cambridge University Press (CUP)Copyright Statement
Country of Publication:
United Kingdom
Language:
English

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